Abrading-shoe for truing up car-wheels.



No. 766,691. PATENTED AUG. 2, 1904. J. M. GRIFFIN.

ABRADING SHE POB. TRUING UP CAR WHEELS.

APPLIUATION FILED un. ao. 1904.

No norm.. a SHEETS-SHEET 1.

WITNESSES UVVEWTOR .viiiorneya No. 766,691. PATENTED AUG. 2, 1904. J. M. GRIFFIN.

ABRADING SHOBFOR TRUING UP CAR WHEELS. APPLIoATIoN FILED APB.. an. 1904.

No MODEL. 2 sums-s311312.

WITWESSES IWVEWTOR Jilorneys.

NITED STATES Patented August 2, 1904.

PATENT OEEICE.

ABRADlNG-SHOE FOR TRUING UP CAR-WHEELS.

SPECIFICATION forming part of Letters Patent No. 766,691, dated August 2, 1904.

Application iiled April 30, 1904. Serial No. 205,692. (No model.)

To /LZZ 7/'707'11l it 71mg/ concern:

Be it known that I, JUDsoN M. GRTFFIN, a citizen of the United States, residing at Detroit, county of IVayne, State of Michigan, have invented a certain new and useful Improvement in AbradingShoes for Truing Up Car-WV heels; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which'it pertains to make and use the same, reference being' had to the accompanying' drawings, which form a part of this specification.

This invention relates to abradingshoes for truing up car-wheels.

It has for its object an improved means of holding the block of abrading material in the case or head.

In the drawings, Fig'ure l shows a case with diagonal holding-ribs. Fig'. 2 shows a case with a serpentine holding-rib. Fig'. 3 shows a case with a serpentine layer of coiled wire. Fig. et is a crosssection of Fig'. 3. Fig. 5 shows the holding-ribs transverse the cavity of the slice-casing'. Fig. 6 is a cross-section at thc line .fr .1f of the device shown in Fig. 5. Fig. 7 is a crosssection of a case in which the material is held by means of layers of for-aminous material or wire-netting'. Fig'. 8 is a cross-section at the line 1/ 1/ of Fig. 5. Fig. 9 is a cross-section showing ribs of foraminous material inserted to present an edge of the foraminous material at the abrading-surface.

In abrading-shoes for truing up car-wheels the abrading material is preferably placed in the cavity of the shoe-case in a plastic or wet condition and is subsequently cured and burned or baked to render the block of abrading material hard and durable; but it frequently happens that in use the abrading-block is struck by some hard article and broken, and if a small part of it be freed, so that it can escape from position, the entire block rapidly breaks down and escapes, and the object of this invention is to prevent to as g'reat an extent as possible the escape of small parts that may be broken, and thus leave an unsupported edge or end of the block which rapidly wears and crumbles away.

In the form shown in Fig. 9 netting is inserted in the cavity with thc rear edge of the netting engaging against the bottom of the cavity and with the free edge extending' t0- ward or to the grinding-surface of the block. The wire web supports the surface of the abrading-block along the groove l0.

The shoe may be made with a single boxlike cavity or as shown in Figs. 2, 3, and 5, or it may be made with a plurality of cavities, as shown in Fig'. 1. In either case I secure to the bottom of the shoe the ribs 2 of Fig'. l or the serpentine rib 3 of Fig'. 2 or the transverse ribs 4 of Fig'. 4, or in place of ribs, which are preferably made integral with the casing, I lay into the cavity of the shoe a holding' device consisting of a spiral of wire 5, that is placed at intervalsvas, for example, in the serpentine form of Fig'. 3 it is itself held in place and from escaping from the cavity by lugs 6, that engag'e the wire of the coil and aid in holding' it in place. In either instance the holding device is embedded in the block of abrading' material and serves to prevent the block itself from breaking and if it be slightly broken serves to hold the pieces from escaping'. The ribs in each instance are wider at their surface than along the line at which they emerge from the casing, and in that class of shoes with which grooved abrading-blocks are used the ribs are correspondingly grooved.

In the form shown in Fig. 7 the abradingblock is held together by layers of netting 8 and 9, laid in the plastic material when the block is making' and left in when the block is baked.

In either of the forms shown the abrasive material is placed in position with a portion thereof projecting from the shoe and with the projecting face arranged to bear against and wear those portions of the tread of the wheel and those portions of the iiange of the wheel which are not normally cut and worn by the use of the wheel, leaving' the part of the abrading-surface which in use lies opposite the worn part of the wheel of a somewhat concave or grooved form.

The abrading material while in a plastic condition is crowded into the cavity under the overhanging walls and under the overhanging Walls of the ribs and through the holes of foraminous holders inserted in the shoe Yor through the mesh of webbing inserted therein.

What I claim is- 1. An abrasive shoe Yfor truing up car- Wheels,having in combination a case, an abradingblock having a longitudinally-grooved face and holding means inserted in the abrading-block, substantially as described.

2. In an abrasive shoe for truing up car- Wheels, the combination of a case provided with a cavity to receive an abrading-block, holding means located in the cavity and integral With the Walls thereof, and abrading material engaging the Walls of the cavity and the holding means, substantially as described.

3. In an abrasive shoe for truing up -car- Wheels, in combination With the case provided i J UDSON M. GRIFFIN.

Witnesses:

GHARLEs F. BURTON,

MAY E. Ko'r'r. 

